ice-gdb: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/ice-gdb - from package: avarice

You may install the required package with command yum install {package}

Error in other languages:
ice-gdb: bevel nie gevind nie
ice-gdb: comandă negăsită
ice-gdb: comando não encontrado
ice-gdb: commande introuvable
ice-gdb: command not found
ice-gdb: käsku ei ole
ice-gdb: không tìm thấy lệnh
ice-gdb: komanda nerasta
ice-gdb: Kommando nicht gefunden.
ice-gdb: kommandot finns inte
ice-gdb: komut yok
ice-gdb: nie znaleziono polecenia
ice-gdb: níor aimsíodh an t-ordú
ice-gdb: no se encontró la orden
ice-gdb: no s'ha trobat l'ordre
ice-gdb: opdracht niet gevonden
ice-gdb: parancs nem található
ice-gdb: perintah tidak ditemukan
ice-gdb: príkaz nenájdený
ice-gdb: příkaz nenalezen
ice-gdb: команда не найдена
ice-gdb: командата не е открита
ice-gdb: 命令找不到
ice-gdb: コマンドが見つかりません